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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602bfbb5e5f853b8f9310877f32dafb312f718afbf4bbeb908df2a701ca0fbce' 
  AND token = 'qv+ZdF3Zvm0vkTqiiZkefVAe0PMMxb/Rfb6s/miltUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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