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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a345d7a02e274806b0a494a067918cee5f094d5f0c3fae67fb4f5eb49a3797' 
  AND token = 'GTZolrXP2RQWAN4nQsAkIP95rHjhm+IhcMjOgJuPJ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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