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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bcc89c2fbb7fde9e44366728ae9e7bd9cbad5d1701e491714101b1fc72a77a' 
  AND token = '25tv9bEvmAOggTdaj6Hg+tssLIc2TutkA7Iqn2OMh40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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