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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b628bf28e570db87f4c3069c3a933fe540b5c855c1616b85764bf2f4e3f23c2b' 
  AND token = 'QJAi5X0SP+YIKa6zg2yDySOzCfVi69TRVKF999ym8uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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