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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593059916bb3175d54d6d2dfbd010a9ba35da0c3ce9efe18e88794fcc5c35c0c' 
  AND token = 'VwpAdcs+L3rleBtKy9QngFoBLds/L+FWLAofxANUS3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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