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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a5fd3cc71ffc4b914312a1e2b7bb1cac2d41f3c7477812c85d509f5d1f613b' 
  AND token = 'm1YJ3R2XJYmaUj6/rnWxxVYH7466upfX+w2xJYaKpR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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