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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3676c228474be603c152637b3271f07f2fcba2c07d6a26926d4a100c25bd661a' 
  AND token = 'ebkUi+yxq8Lj2gqu1krAXO7QEpjdpt06UGzORfEUk+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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