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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e498e4c4c2cad0c2210eeb6f697dba69af6ca974f929e3cf5c3b37c7ca4b08' 
  AND token = 'jGsJyCL+CNPecNgvbaisqYKrPmfMCwZ7Z+Js+DzF1SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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