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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd028ff2d5d7d6ef8f108bb64e27e9bcee7501c0de117c92ce7e3aa8634c26214' 
  AND token = 'RNDlC3nXsPZfM6DZDBfaQuEiPHWPxE+rOgLsGLzuoC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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