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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12819331eefc60b0e3c87ceaff15f12684dcb55753c2d3be529f21bc358ee8cb' 
  AND token = '7MAJxfvBDFu007oGOplqJrN9N1k6sMgGLoLR7x75Oeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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