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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dab88119a4560ddbd6293be061a2d9a768bc02b1463b3ee8e39226f584a3e74' 
  AND token = 'iulbDvSUVh02c2O7OcJ8MoTgaKUWgyrs4rc9eop04ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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