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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3474b42dfbcf7908d08ce61ae9ccb7ac1faabf966e9af4c79b9e7d860e4e814' 
  AND token = 'ClszX8RSLEvNIQ0pz/BbtZvgdtTnKceOByo8j92nOvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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