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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9b861a6e91b911d746bdf9d872de1e78102fc61ec28d8ea00eadf5138e9b7e' 
  AND token = 'iCr4wPxD/Aw8u0MjI6VVo5kV3Xhc+2/9Sv9DqV/h5+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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