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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ef289c0d73138cd0a92631e854b27a275bb1f1170a36f69a813e97cdd4e6dc' 
  AND token = 'tivxUTSITbPDaU1fkGACbi6iuCJMFHvP+fhiKURP+O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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