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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889ac63e55cf3d673ed74b3ad5b4dee3343474c3d299431ea1bec3f9dff6eb25' 
  AND token = 'nj9cxSHFsy0M6SuMbDtKqVktlR3DM4b55Nxt21QYeLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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