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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855d60e7697b343345a4fd81038f67fe934bbcf7cd597eef1a5ad90d6fb8bc5f' 
  AND token = '/lV+n4/oeIwVr8DxZWh7HxVtp20zA2G718MCmNBBxD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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