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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a439b71501c6362691d761c8755510b800e91f45ecec6f645df96f0cfce1b93' 
  AND token = 'J7A4QE0Bg6f0/htB8Qr4o5g4L1I1O3++rIKOATe9Cz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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