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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c881661b039926db9be8a7efa135655ada57ca46033f4f6c4375572aa6abb17b' 
  AND token = 'gvf4bSb8Kp+zAjVR/tiQbeZ2LCjf8Y5pDHiNtYINk4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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