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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a396ce9ac07a8f5c01293d70be9ce7a2ce6b2440db6a6cb0b4678f5a066b38' 
  AND token = 'eLCYGaZvgGyZG52Bs/d/Kr5ERxqEq02HLZX/AJQpOrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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