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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e983c20a5ba956906684aa594e503e7237f812d492badb84ba184d03b0cc45' 
  AND token = 'zgBh4tg08iQR1C7qmhRD9++40r2dt9PbNHn9Ik93txc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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