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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f3895abf0fa8bea40c7e9fd9dce7afa834dd961c282f61e4d471390a4d5b58' 
  AND token = 'AfyI83UrY6EAsuoXWxbixfh373R/pHD7lMDTn5F66Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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