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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e6a78629e97f4e40249baa43f926e7f971db20e307d174f5976a60b950edb0' 
  AND token = 'kPe05vBUAy7YyHh4/4/gH2dXrcIbK2V44eUJlGlybos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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