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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ecd2e14f2d932222618f7c21f169feaa46c4141a24e4353bba69d2189e472a4' 
  AND token = 'MoDhH1eSaY5dD/39RNXOQwl8lD2U1jmGvXPUAxHvpU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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