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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67852934e2298f5b7d49f64e3b91bf98bb69ade1e93caef211fa2056ea476f16' 
  AND token = 'm0HHcEhXwOWs2Ry4LO+ngWwlwz9E4cGLfxOOcMAOwMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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