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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d626b0e4c70704655e97765a2b413e2f21e0efb4031eafc1a85ce41c2c910f4' 
  AND token = 'RZYX5e5VrdxMCnS3mtjoO5+a3Leq8zy2LgymVcJuuQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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