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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b21f402ef9c4aa6a4a0c0c1374569c562b011cf3595c8a53998ae0c793ff9b6' 
  AND token = 'n9X8tkHNZRar9xbjoolMSfJRZ9yjjGOEnEWFp5I78LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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