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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7096f3611bd2d897259669ed72d25444b5edbebfa679042efc750ea2e41a95ec' 
  AND token = 'as9Z0GPgEsZ+qqbvekDoXqi8isPy9PkF3SX7Omjf3uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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