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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877d0ec8cac5a2c0a0aacb182d2659776858664ff00b4698037993e350a75b90' 
  AND token = 'zpVFEgtV2ck1fhHWvs32+l75sQL4UnOQ4X3QwAhz1cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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