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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d4dc1450d0bd80fe46f277a11b83ce2cfb83c2492a973aa92ae15f40d28a68' 
  AND token = 'kcMHgECyG8TZ4eSr4ZyM1slkDLqF3ygY3xlV/TYky8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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