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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f523d2427b8b54d0fa06a9c01a4f1c10c72f3044427e5db4e418f277f14749' 
  AND token = 'rJTjWXrYylMw6Lcar46r91BSM4tBriKcfbiYaZDr/do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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