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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ccb4f7e2c506565bd3ac44133d717e407a8c3d413019a4df39a430f3d7b4e3' 
  AND token = 'cvroAiB6lVZ6AlbArEFXlcZHWbu1Ry/Gi7xA4cdfgs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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