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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2405bd8c8c7841dcde9fa873c0f342b8bb5e31cd5a68e7b704f989184b4a99' 
  AND token = 'EYP9XtrjN81RHRwvHzKx84B3ezTz04Rc+oEOaFAd9ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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