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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d8d889b3802b96d0495313e8b88f96231608ceca0443aaad36d4af034b27c5' 
  AND token = 'fpZ6PKeCM78oekH+BcKXuFUEbX9F6dolqrfOdhT4l04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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