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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bebf23bb7ebb2ada8b8ecedd6b60368b0771531757e36bcda3d6011df3232fa' 
  AND token = 'Jy1pmvPxVLBc2sucnq3kzL2o7x4nKcI5fYn68caEBt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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