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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fd08d25a6c4079ee93bd8f719a50cfd33822c3cf07bb6ab08ee02a533dd07f' 
  AND token = 'so7RNATh592rle0e/wUv9g28oESrThofFxJpEJXKW+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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