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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a96dceea1ef1f0c72fa4e1f0fbb7e85aabf30c7d97709fe5b014e9a54c76736' 
  AND token = 'fJ53vTD9EYCmrwqcGEyoRNWYcVXJaPX1s7ilABZms/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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