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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ecf9e3de4726260e16aa431351ea6bb192b5e53cab8034d2da95da7d84b49e' 
  AND token = '1QHNJaravWwdYkxSkSNuBoexg9OZhUAgSTwDpnoIZkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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