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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13761a401738a21752bb5a1ec80cb13f172c59f8de5997f15dedb65c1d30d279' 
  AND token = 'JTRPIjhOms0U7rZ/EOp/+CkcEwkyctSp5nk7MY5yJ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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