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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167c512acfaba476a4dcdf5d61d86afe2d14261d11f7d0432c723bed4dd537ae' 
  AND token = 'uG65oTq/5egdD9hM1zNGKtIsUVt+wr7aGDT3N8xOIso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}