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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36f63ce254fc0d37852f153d89f79f2f7eefdda81eeb1122f7f0bd3f36ca689' 
  AND token = '9Y6sITK2+xCT8e5v+K8RPrZQSyYTdSP3t6uIXbe61yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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