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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2455d7abd2377405a008eca0618b2c5efd03bc3550ab7eabe02ec341b3b875' 
  AND token = 'Q4yOMFQ6uowsUkBuEiu90w58Fv7SP88oz0z+RSdOUYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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