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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d103f34dd21a2dc7d10324ae0def1b8a8bd94a0be3953261304ffdb9872b1a3' 
  AND token = '3D/+eo/EgBpvO3sL/w7WbeMvKSaDNGLWivyvSEDB1gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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