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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a730c67f11b3698161fc21a2a25264667c690d112b826fce661d2c29a04b2a' 
  AND token = 'czrlBNDboYloXP4oqhgLBhEZceJHETBEaLPI5JxehHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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