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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b17c228b76731081a140b4924ca52569329eb27956e11aabea3d759f02fc114' 
  AND token = '1EApSK3tfR+fpjHHpPpqrJxxJcI5M0vK5DlEJI1b16A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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