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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f146142b598cdcb8ddf11a722e634b0076b58c01c85c8fadb8d7eff44e4f2c2' 
  AND token = 'bOggRrFEmB7lQlHVsPIk8/fW3mwiAOBiZs+9QQhi33c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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