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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef2c5c3086c5ffe23eeb260f34b45fe65e1280607692009fb4326ac55f5f9af' 
  AND token = 'G87QbxwLUyeQthXggnHO/M2VkO9EoRg/xvBX4M661oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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