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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5174038c8c152d0d05d78ebf445a6832bb6a65e5c88039c749d3a770ee01cfc7' 
  AND token = '+j39DZ1+EN2l2m35Az6Srl1XBr5e/pw1ORAW+nBd+Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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