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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f632fb49dfc7ea62fab467ffaea8e3a1071ca632b364ed55dc11911705acd5' 
  AND token = 'TL6sx3E3969FbGX+ejI13IZMYAcdE94/xxKZUES2Vv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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