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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e153c8807777a14fbc702a8e8f4e4adc2735bc9386e07b959bfe915c136177' 
  AND token = '8x9C4SQwZj4DgpFvgmdvS6k8pwoQKVDd/C9kO/0TN5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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