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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fa8dee9ebcc21f66595772813c614d03c7a990aff4a1215ba5edafc8318fd0' 
  AND token = '3hM+XP905UrN4TCNz6b6rOhqyvJAvbFEOc6OsWUVsdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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