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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a3cc3cc8c94c7ddd23b70d1df57b44986c065e25c9a9518c695bec171005ae' 
  AND token = 'dEDKycyH+9oGCDhcYZtDoOnR/hX3EXtw2MEOPBtdagA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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