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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37aa05db4cc46b85c77983df198f35b31b948f6c69cdfdad38f28d2a7a603e72' 
  AND token = 'bhSljOnLmG+a7FobrtT2cFZ9G8ZefiD/a139tYeSqOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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