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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca5b8a732f29002ab92ef93b45f906dbaf9423c1eb25a7876ace0a3dcc60184' 
  AND token = 'MIVDb8OlVwUyzzqCwmHpg4P7bPpnHGzyVvMGamk5VTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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