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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56126f5e96081eb0068d6037c40fc710dc5a3959a915794f8fe4b0d5e35eb267' 
  AND token = 'kdGhedezEToL4bijI1JGla61B4pxHoJNrC7lz+XyArI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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