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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17516136642d71a6bc167b071b501fac8ae67888112898f63466e43a3fb6b4f0' 
  AND token = 'dJxM3itOp2M/JvKd41b0wsjT8yNQIpgByuOZmE65WPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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