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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b1cbd141f11d47ad07993f0d686dbf314f78b5aae3eab4f657a640b72ccdc0' 
  AND token = 'eBiPkx/kiMd1bVHTG6PaVA9uCE+fJ0IfN835j1TmWTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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