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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ef1177afe7135cee818ca2b3714a44fbd2c4433a3967475457a9742365209c' 
  AND token = 'oMXGprK4JyU9WYh/jIiQXWQCGPHtZEendifsv9NJ5uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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