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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848f3c9d90f0e04beab5a3b353adc6e360a149006fd02da979ae6f86937f58d2' 
  AND token = 'LmYox3ibowWkGlZ1FYOAWlpbwppoo5gV4VspT4Rmhjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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