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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742086956208399f89b898e76802faa4d79928c4af901196985e0399b8cc9cbc' 
  AND token = 'i/HwM3luFbMCqpTPU/SkLe/fRGGU2mgdRi10yRIt4so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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